9720

• UCREFRP Catalog Number: 9720
• Author: U.S. Fish and Wildlife Service.
• Title: Razorback sucker ‎(Xyrauchen texanus)‎ genetics management and captive propagation plan, Dexter National Fish Hatchery and Technology Center.
• USFW Year: 2004.
• USFW - Doc Type: Dexter National Fish Hatchery and Technology Center
• Copyright Material: NO

NFHTC and Willow Beach NFH (from the lower basin) and Grand Valley Endangered Fish Facility
(from the upper basin).
Table 1. Upper Basin Razorback Sucker Captive Broodstocks
Grand Valley Endangered Fish Facility
Numbers Founders Lot
Year Class Origin on hand Represented Designation
1995 CR,EP,GV,SJ *285 19 pairs 95
1995 GR *20 2 ? lo' 95 GR F1
1996-98 Willow Beach/Mohave *285 19 pairs 98 LB
1999 CR,EP,GR, GV,SJ *375 25 pairs 99
Ouray National Fish Hatchery
1989-1991 GR 67 15y 13e (3 lots) 89-91 GR RBS
1993-2000 GR 849 19 pairs 93-00 GR RBS
2001 GR,CR,SJ 360 3 pairs 01 GR RBS
Wahweap State Fish Hatchery
1997 Ouray 71 1 pair
1998 Ouray 301 5 pairs
1999 Ouray 342 9 pairs
2000 Ouray 68 2 pairs
1991-1995 Ouray 143 6 pairs
CR- Colorado River, EP- Etter Pond, GV- Grand Valley, GR-Green River, SJ- San Juan River,
LB- Lower Basin.
* estimated numbers.
Lower Colorado River Basin Recovery Unit
In the lower basin, the Colorado River system was drastically altered during the 20th
century in the course of major water development and construction. The mainstem river and the
Gila and Salt/Verde tributaries were impounded by impassable dams, creating a chain of
8